974 Eu-Floridese, Polysiphoniese, Bryothamnion. 



Grev. Syn. p. XLVI, Physcophora triangularis Kuetz. Phyc. gen. 

 p. 434, tab. 57, fig. 1, Alsidium triangulare J. Ag. in Linn. XV, 

 p. 28, Harv. Nereis Austral. pag. 30 et Ner. Bor. Araer. pag. 15, 

 tab. XIII A, Fucus minimus dentatus triangularis Sloane Jam. 

 tab. 20, fig. 9, Fucus triqueter GrmeL Hist. Fuc. p. 122, tab. 8, 

 fig. 4, Esp. Ic. t. 129, Fucus trifarius Sw. Prodr. pag. 148. — 

 Fronde triangulari, subpinnatim decoraposito-ramosa fastigiata, ra- 

 mis inferne denudatis, superne trifariam dense ramulosis, ramulis 

 supra basin simplicem apiee acute tricuspidatis rigidis: stichidiis 

 axillaribus, dense fasciculatis, mollibus, torulosis. 



Hab. ad insulas Indiae occidentalis et oras Americae calidioris, 

 a Florida ad Brasiliam usque ; ex oris occidentalibus Africae (Kuet- 

 zing); ad insulam « Rolas » in sinu Guineae (Greeff). — Frondes 

 ut plurimum 8-15 em. longae, a radice scutatim expansa surgentes, 

 stipite teretiusculo pennae corvinaB crassitiem fere metiente nunc 

 multo elatiores, inferne parcius, superne densissime ramosse fasti- 

 giatse. Rami vagi, ordine inter pinnatum et dichotoraum ambiguo, 

 in iina parte sensim denudati, superne trifariam dense ramulosi, 

 ramulis apice imbricatis; rachis ramorum angulis rotundatis in- 

 ferne teretiuscula, superne evidentius triquetra. Ramulis trifariam 

 lineis spiraliter adscendentibus dispositi, omnes subaequales, 2 mm. 

 fere longi, inferiores hic illic simplices, plurimi basi simplices, ex 

 tereti conipressi, apice ut plurimum tricuspidati, dentibus conicis 

 rigide subulatis. Stichidia in axilla ramulorum nunc inter cuspides 

 provenientia, fruticulos minutos, ramulis breviores formantia. a 

 ramello axillari transformata et sterilibus paucis ramellis conicis 

 stipata, densissime fasciculata inollia, petiolo filiformi singula suf- 

 fulta, a medio circiter fertilia, admodum torulosa acuminata-obtu- 

 siuscula, tetrasporangia in articulis singula (raro in infimo gemina se 

 observasse contendit ill. J. Agardh) linea spirali unica adscendente 

 disposita foventia, effoeta prolongata et filiformia at circuincirca 

 toruloso-insequalia. Rami minores ramulique plus minus articulis 

 interioribus translucentibus fasciati adparent, omnes corticati; r.i- 

 melli tantum steriles, stichidia circumdantes (in fasciculo axillari) 

 ecorticati polysiphonii, articulos diainetro circiter duplo breviores 

 raonstrantes. Sectio transversalis rainoruni principalium monstraf 

 siphones pericentrales 7-8 (8-9 sec. Falkenberg) cellulis consiniili- 

 bus cinctos, cellulis extimis minimis corticem constituentibus. Co- 

 lor alga3 recentis purpurascens, exsiccatione sa^pe in sordide ffavum 

 aut virescentem abiens. Substantia firma, cartilaginea. 



